using System;
using System.Collections.Generic;
using System.Linq;
using Developpez.Dotnet.Collections;
using NUnit.Framework;

namespace Developpez.Dotnet.Tests.Collections
{
    [TestFixture]
    public class OrderedDictionaryTests
    {
        [Test]
        public void Test_AddCountContainsGet()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            Assert.AreEqual(1, dict.Count);
            Assert.IsTrue(dict.ContainsKey("hello"));
            Assert.AreEqual(dict["hello"], 42);
        }

        [Test]
        public void Test_AddDuplicateKey()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            Assert.Throws<ArgumentException>(() => dict.Add("hello", 0));
        }

        [Test]
        public void Test_GetMissingKey()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            Assert.Throws<KeyNotFoundException>(() => Console.WriteLine(dict["hell"]));
        }

        [Test]
        public void Test_Set()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            dict["aa"] = 3;
            dict["hello"] = 1;
            Assert.AreEqual(3, dict["aa"]);
            Assert.AreEqual(1, dict["hello"]);
        }

        [Test]
        public void Test_KeysValues()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            dict.Add("aa", 3);
            dict["bb"] = 42;
            dict.Remove("aa");
            dict["hello"] = 35;
            dict["aa"] = 50;
            dict["cc"] = 1;

            CollectionAssert.AreEqual(dict.Keys, dict.Select(kvp => kvp.Key));
            CollectionAssert.AreEqual(dict.Values, dict.Select(kvp => kvp.Value));
        }

        [Test]
        public void Test_OrderIsMaintained()
        {
            var dict = new OrderedDictionary<string, int>();
            dict.Add("hello", 42);
            dict.Add("aa", 3);
            dict["bb"] = 42;
            dict.Remove("aa");
            dict["hello"] = 35;
            dict["aa"] = 50;
            dict["cc"] = 1;

            //    dict.Keys,
            //    new[] { "hello", "bb", "aa", "cc" });
            CollectionAssert.AreEqual(
                dict.Keys,
                new[] { "hello", "bb", "aa", "cc" });

            //    dict.Values,
            //    new[] { 35, 42, 50, 1 });
            CollectionAssert.AreEqual(
                dict.Values,
                new[] { 35, 42, 50, 1 });
        }
    }
}